METHOD OF PREPARING PHENYL-SUBSTITUTED PYRAZOLE DERIVATIVES Russian patent published in 2000 - IPC

FIELD: agriculture. SUBSTANCE: described is method of preparing new phenyl-substituted pyrazole derivatives of formula II: and salts and esters thereof wherein X₁ and X₂ are halogen or hydrogen; R₁ is C_1-6- alkyl; R₂ is C_1-6 halogen alkyl or alkyl sulfonyl, and R₃ is H or halogen. Compound of formula III: wherein X is as defined above, is oxidized with oxygen or oxygen-containing gas in the presence of oxidation catalyst in inert solvent. EFFECT: new carbocyclically (heterocyclically) substituted benzoic acids suitable as intermediate compounds or precursors for preparing corresponding ester compounds which are useful herbicidal compounds. 8 cl, 6 ex, 1 tbl